<template>
  <view>
    <view class="search-box">
      <uni-search-bar @input="input" :radius="100" cancelButton="none"></uni-search-bar>
    </view>

    <!-- 搜索建议列表 -->
    <view class="sugg-list" v-if="searchResults.length !== 0 ">
      <view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item)">
        <view class="goods-name">
          {{item.goods_name}}
        </view>
        <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
      <!-- 标题区域 -->
      <view class="histoy-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="17" @click="clean"></uni-icons>
      </view>
        <!-- 列表区域 -->
      <view class="histoy-list">
        <uni-tag :text="item" v-for="(item,i) in histories" :key="i" @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view>

  </view>
</template>

<script>
  export default {
    data() {
      return {
        timer: null,
        kw: '',
        // 搜索的结果列表
        searchResults: [],
        //搜索历史的数组
        historyList:[]
      };
    },
    
    onLoad() {
      this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
    },

    methods: {
      // input输入事件的处理函数
      input(e) {
        // console.log(e.value)
        clearTimeout(this.timer)
        this.timer = setTimeout(() => {
          // console.log(e.value)
          this.kw = e.value
          this.getSearchList()
        }, 500)
      },

      async getSearchList() {
        // 判断搜索关键词是否为空
        if (this.kw.length === 0) {
          this.searchResults = []
          return
        }

        const {
          data: res
        } = await uni.$http.get('/api/public/v1/goods/qsearch', {
          query: this.kw
        })
        if (res.meta.status !== 200) return uni.$showMsg()
        this.searchResults = res.message
        
        this.saveSearchHistory()
      },
      
      gotoDetail(item){
        console.log(item.goods_id)
        uni.navigateTo({
          url:'/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id
        })
      },
      
      saveSearchHistory(){
        // this.historyList.push(this.kw)
        const set = new Set(this.historyList)
        set.delete(this.kw)
        set.add(this.kw)
        // console.log(set)
        this.historyList = Array.from(set)
        
        // 对搜索历史数据进行持久化的存储
        uni.setStorageSync('kw',JSON.stringify(this.historyList))
        
      },
      
      clean(){
        this.historyList = []
        uni.setStorageSync('kw','[]')
      },
      
      gotoGoodsList(kw){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?query=' + kw
        })
      }

    },
    
    computed:{
      histories(){
        return [...this.historyList].reverse()
      }
    }

  }
</script>

<style lang="scss">
  .search-box {
    position: sticky;
    top: 0;
    z-index: 999;
  }

  .sugg-list {
    padding: 0 5px;

    .sugg-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 12px;
      padding: 13px 0;
      border-bottom: 1px solid #efefef;

      .goods-name {
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        margin-right: 3px;
      }
    }
  }
  
  .history-box{
    padding: 0 5px;
    .histoy-title{
      display: flex;
      justify-content: space-between;
      height: 40px;
      align-items: center;
      font-size: 13px;
      border-bottom: 1px solid #efefef;
    }
    .histoy-list{
      display: flex;
      flex-wrap: wrap;
      
      .uni-tag{
        margin-top: 5px;
        margin-right: 5px;
      }
    }
  }
</style>
